Crecimiento demográfico en la Ciudad de México (1940- 1970)

You can only extrapolate from a base period, if it is representative. Whether a period is representative or not is a result of the original weighting procedure. The weighting procedure involves internal system procedures that are applied to existing meter reading results, period consumption values or period demand values, in order to determine expected values for

extrapolation and proration

Weighting procedures are predefined as: Linear weighting

Weighting of energy feeding Degree day weighting Sprinkling water portion General weighting

You must define the following with regard to weighting procedures in Customizing: Weighting key

Weighting Key

Allocate user-defined weighting keys to weighting procedures predefined by SAP. For further information read the documentation for the IMG Activity.

Weighting unit

You can define weighting units in Customizing for SAP Utilities under Device Management ® Meter Reading ® Weighting Procedure ® User- Defined Weighting ® Define Weighting Unit.

A weighting unit is a fixed value, such as energy feeding volume or issue quantity of energy or water that was issued in a certain period in a service territory.

The periods for the distribution of weighting units are always indicated by the month or day and are year-independent.

The weighting portion of a certain period results from the relationship of the weighting units for this period, to the total weighting units for a year. Example:

The sum of the weighting units for one year is 1000.

Weighting units valid from 01.01 (100) : Total weighting units (1000) = Weighting portion from 01.01 to 02.01. (10%)

For further information read the documentation for the IMG Activity. You must also enter the following in the Utilities Industry menu:

Minimum portion in percent

Enter the minimum portion in percent, in the rate. The rate is under the following path in the Utilities Industry menu: Billing ® Master Data The minimum portion in percent is used to determine the minimum requirements for the representativeness of the base period. If you enter a low minimum portion in percent, the meter reading results are used from a short period for extrapolation.

If you enter 100% as the minimum portion, the system uses the existing meter reading results as a basis for extrapolation, as long as meter reading results are available for a complete billing period.

Period length of the portion

Enter the period length in the portion. The portion is under the following path in the Utilities Industry menu: Scheduling ® Schedule Master Record. The period length of the portion defines the intervals for billing the associated contracts.

Linear weighting

The linear weighting procedure does not take seasonal fluctuations into account. For linear weighting, the weighting units are distributed equally over the year, whereby the system takes one weighting unit into account for each day. The total of the weighting values is 365 for one year or 366 for a leap year.

Weighting of energy feeding or degree day weighting

These weighting procedures take seasonal fluctuations into account.

The total weight for one year is 1000.

The weighting portion for January is 200: 1.000 = 20% The weighting portion for February is 150: 1.000 = 15% and so on.

User-defined weighting

The total weight for one year is 1,200.

The weighting portions for months January to December are 100: 1.200.

Mixed weighting procedure

The mixed weighting procedure also takes seasonal fluctuation into account.

Enter the weighting key in the rate for the weighting of energy feeding procedure, degree day weighting procedure or for the sprinkling water portion. Enter a

consumption fixed value to be weighted linearly or a consumption percentage for weighting in the installation structure at register level or in the register

data during device installation.

The consumption value to be weighted linearly is a fixed value per day that is weighed linearly for extrapolation, independently of the weighting procedure (for example, 5 weighting units per day).

The consumption percentage for weighting is a percentage portion of the total weighting units per day. It is split linearly for extrapolation, independently of the weighting procedure (for example, 20% of the total weighting units per day).

The absolute or percentage sprinkling water portion, not taken into account for wastewater calculation, is specified for the water division. The difference between the applied fresh water quantity and the sprinkling water portion is equal to the waste water portion to be calculated.

If you enter a consumption value to be weighted linearly, you must also enter a validity period for which this value is taken into account

The total weight for one year is 1,100. The weighting portion for January is 150: 1.100. The weighting portion for February is 125: 1.100. and so on.

Determining whether a period is representative

To determine whether a base period is representative, use the following calculation:

Minimum portion in percent * Length of meter reading period = Minimum length of base period

or

Weighting portion of period = Minimum portion

Example:

The following meter reading reasons exist:

Periodic meter reading

Final meter reading

Meter reading at move-in (M)

Meter reading at installation (I)

Interim meter reading without billing (Y)

Interim meter reading with billing (Z)

Control meter reading

The period length of the portion is 1 year (365 days) The minimum portion defined in the rate is 50%